安装Running Traefik - HTTP Reverse Proxy and Load Balancer - in Docker

What is Traefik?

Traefik (pronounced traffic) is a modern HTTP reverse proxy and load balancer that makes deploying microservices easy. Traefik integrates with your existing infrastructure components [...] and configures itself automatically and dynamically. Pointing Traefik at your orchestrator should be the only configuration step you need. -https://github.com/traefik/traefik

Installing Docker

Log into the Linux based device
Run the following commands in the terminal
# install prerequisites
sudo apt install apt-transport-https ca-certificates curl software-properties-common gnupg-agent -y
# add docker gpg key
curl -fsSL https://download.docker.com/linux/$(awk -F'=' '/^ID=/{ print $NF }' /etc/os-release)/gpg | sudo apt-key add -
# add docker software repository
sudo add-apt-repository "deb [arch=$(dpkg --print-architecture)] https://download.docker.com/linux/$(awk -F'=' '/^ID=/{ print $NF }' /etc/os-release) $(lsb_release -cs) stable"
# install docker
sudo apt install docker-ce docker-compose containerd.io -y
# enable and start docker service
sudo systemctl enable docker && sudo systemctl start docker
# add the current user to the docker group
sudo usermod -aG docker $USER
# reauthenticate for the new group membership to take effect
su - $USER

Running Traefik

Continue with the following commands in a terminal window
# create a working directory
mkdir ~/docker/traefik -p
# create and edit config file
nano ~/docker/traefik/traefik.yml
Paste the following default configuration into traefik.yml, replacing the hostname with the docker host
## traefik.yml

# Docker configuration backend
providers:
docker:
defaultRule: "Host(`{{ trimPrefix `/` .Name }}.<% dockerhost.fqdn %>`)"

# API and dashboard configuration
api:
insecure: true
Press CTRL+O, Enter, CTRL+X to write the changes
Continue with the following commands in a terminal window
# start the traefik container
docker run -d --name=traefik -p 8080:8080 -p 80:80 -v ~/docker/traefik/traefik.yml:/etc/traefik/traefik.yml -v /var/run/docker.sock:/var/run/docker.sock traefik
Open a web browser and navigate to http://DNSorIP:8080
Welcome to the Traefik web dashboard

Dynamic Container Ingress Testing

Continue with the following commands in a terminal window
# start a basic whoami web service
docker run -d --name whoami -p 40001:80 traefik/whoami
Back in the web browser, navigate to whoami.<% docker host %>
The Apache HTTPD server response should be displayed
Back in the Traefik dashboard the new whoami HTTP router should display
Let's try one more test
# create an apache2 working directory
mkdir ~/docker/apache2/htdocs -p
# create a test html file
echo '<html><body><h1>Hello world</h1><h3>Have you subscribed yet?</h3></body></html>' > ~/docker/apache2/htdocs/index.html
# start a basic apache httpd server
docker run -d --name httpd -p 40002:80 -v ~/docker/apache2/htdocs:/usr/local/apache2/htdocs/ httpd
Back in the web browser, navigate to httpd.<% docker host %>
The Apache HTTPD server response should be displayed
Back in the Traefik dashboard the new httpd HTTP router should display

Documentation: https://doc.traefik.io/traefik/